Safety-stop for box-staying and similar machines.



B. L. KABACK & S. SHELLY.

SAFETY STOP FOR BOX STAYING AND SIMILAR MACHINES.

APPLICATION FILED NOV. 22. I915.

1 ,1 92,206. Patented July 1916.

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B. L. KABACK & SJSHELLY. SAFETY STOP FOR BOX STAYING AND SIMILAR MACHINES.

APPLICATION HLED HOV. 22,1915.

' 2-5HEETSSHEET 2.

Patented July 25, 1916.

Ben a L 4 0246 A daria fsfic/{y ac WH-JAM/ UNITED STATES PATENT OFFICE.

BENJAMIN L. KABACK AND SAMUEL SHELLY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO NATIONAL METAL EDGE BOX COMPANY, OF PHILADELPHIA, PENN SYLVANIA, A CORPGRA'IION OF PENNSYLVANIA.

SAFETY-STOP'FOR BOX-STAYING AND SIMILAR MACHINES.

Application filed November 22, 1915.

To all whom it may concern:

Be it known that we, BENJAMIN L. KABAoK and SAMUEL SI-IELLY, citizens of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania have invented a new and useful Improvement in Safety-Stops for Box- Staying and Similar Machines, of which the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, which form a part of this specification.

Our invention relates to that class of machines in which a die is caused to descend upon a rigid anvil, between which are placed a box and stay or other articles to be compressed.

In box staying machines such as described in connection with our invention, the anvil is usually of rectangular cross section and positioned diamond-wise, with its horizontal active edge uppermost. Against this edge and contiguous surfaces the die descends and does its work.

Our invention, however, may be applied with equal effectiveness to machines in which anvil and die present flat horizontal surfaces between which the compression takes place.

In the operation, for example, of staying a box-angle, the operative places the two sides forming said angle upon the faces of the anvil contiguous to the active edge, and holds the same close with his fingers during the action of the die in the application of the stay. This requires that the operator shall keep his fingers close to the joint and yet not too close. To decrease danger of accident and protect the operator, it is de sirable to provide some safety device therefor.

The object of this invention is to provide such a safety stop wherein appropriate parts are supplied, attached to the die holder, and projecting downwardly in advance of the die, and so positioned as to contact with the operators fingers if he has inadvertently placed them within the danger zone, and thereby immediately act to release the die holder from its impelling mechanism Specification of Letters Patent.

Patented July 25, 1916.

Serial No. 62,734.

and to apply a stop which positively prevents its further descent.

In the accompanying drawings, which illustrate a preferred embodiment of our invention: Figure 1 is a side elevation of a box-staying machine embodying our invention. Fig. 2 is a partial sectional View of same. Fig. 3 is an enlarged detail view of the die holder and contiguous parts. Fig. 4 is a central cross section through the same. Fig. 5 is a horizontal section on line 55 of Fig. 4. Fig. 6 is a fragmentary view showing slip link connection with die holder pm.

To understand the application of our in vention to a box staying machine, it is advisable to first explain the general construction and mode of operation of such a machine.

The metal staying strip a is carried on a drum 6 at the rear of the machine, and led through a throat 0 to the under side of the (lie cl. The strip is fed forward by a pawl 6 carried by a block, which slides along throat c and is actuated by a bell crank 7, which is given an oscillating movement by connection with the main crank pin 9. The staying strip is held by a pawl 71. as it is fed forward.

Die (Z is actuated vertically by a knuckle lever j and a link is, operated by a connecting rod m from main crank pin 9. The main crank is on a shaft n which is connected by gearing o with a driving shaft p carrying a belt pulley 9. A foot lever r operates a clutch (not shown) connecting shaft n with gearing 0, such that by pressing down the foot lever the clutch is opened and driving connection with the dieholder is broken. In order that stoppage of the machine may be instantaneouswhen this takes place, shaft a is engaged'by an adjustable friction clamp s. It is unnecessary to describe this mechanism in further detail, as it is old and well understood in the art.

Die (Z is carried by a die holder t slidable in ways it on the frame of the machine. The anvil o is rigidly mounted on the front of said frame directly below the die. A finger guard 7, of light frame construction, is carried by the die holder, and presents horizontal guarding edges on both sides of the die and slightly in advance thereof. These edges are turned inward toward each other, not enough to interfere with the normal working of the die, but sufficiently to surely contact with the operators fingers if they should be in dangerous position, as shown in Fig. 1.

Guard 7 consists of the two side frames above described, tied together by strips 8 above the die holder, and is carried by a hanger 9 extending upwardly from one of the side frames; the same forming what may be called a tripping lever, which is thus slidable upward, as by contact with the operators fingers as above stated. Such up- ,ward movement, by means to be herein described, causes the die holder t to be disconnected from its actuating mechanism and at the same time operates a stop to prevent the further descent of the die.

Directly beneath pin 10 of the die holder, and arranged for slidable motion in line with said pin, is a tripping and locking bar 11. Springs 12, carried by the die holder, act upon the outer end of bar 11 to press it inwardly so that its opposite beveled end takes into notches on a rack 13 attached to ways it on the frame of themachine. The outer end of this bar 11 passes through an opening in hanger 9, therebysupporting the hanger together with the finger guard connected therewith.

Bar 11 is normally held out of contact with rack 13 by means of a latch, formed by a projection 14 near the outer end of the bar, being caught by the upper edge of the opening in hanger 9 carrying the finger guard. Thus, when the guard is raised, said hanger is lifted free of the projecting catch 14, and springs 12 act to throw bar 11 to the left (see Figs. 4 and 5) into engagement with'rack 13. This action would instantly stop the descent of the die holder and therefore, before it can take place, disconnection with the driving mechanism must be accomplished. To effect this disconnection we have slotted the hole in the end of link which engages pin 10, as shown in Figs. 3 and 6. A lug 15 is attached to the end of link 70, in such position that when the link is in engagement with pin 10, said lug projects into a cut-way portion 16 of bar 11. This cutaway portion of the bar is of such shape and extent that when bar 11 is thrown in toward rack 13, it will act upon lug 15 to- In order to again connect link '70 with pin 10 in the return motion of the machine, we provide a small link 17, pivoted to the outer end of pin 10, and having slotted connection with a pin 18 on link It. By this means link 70 is allowed to descend freely, as above stated, when connection is broken. On the upward motion of the link, however, when pin 18 reaches the end of the slot in link 17, the two links will straighten out and the slotted end of link 76 will be drawn into place about pin 10. Thus, in the continued upward movement, the die holder will be raised, and before it reaches its highest point, the beveled end of bar 11 will contact with the cam face 19 on rack piece 13, and the bar will be forced out to its normal posi tion, allowing finger guard hanger 9 to again drop back of projection 14. In order to nicely adjust the height at which guard 9 shall be carried, we have provided an adjusting screw 20, set into bar 11, upon which hanger 9 rests.

Rack 13 is arranged with several teeth as shown, the lowest tooth corresponding with a minimum height of die d above the anvil. Below this tooth, the rack bar widens out to its original thickness. This insures that there shall be no interruption in the action of the machine, after the die has descended below the above mentioned minimum height, say 'aquarter of an inch, or less, below which no finger could pass. If, in this further distance, the guard should contact with 3 against the full thickness of the rack bar and would be held from sliding to disconnect the parts.

The finger guards, being suspended centrally of their length, provide effective protection for their full length, which may be the full length of the anvil. Moreover, they are made so light and arranged to slide so easily upon the die and die holder that no crushing of or injury to the fingers can occur when the device is operatively in use.

Having now fully described our invention, what we claim and desire to protect by Letters Patent is 1. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a releasable driving connection affording in its normal position a rigid connection between the driving mechanism and said member, a normally inoperative tripping lever, and means c011- trolled by the tripping lever to release said driving connection.

2. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a releasable driving connection affording in its normal position a rigid connection between the driving mechanism and said member, a normally inoperative step for arresting the operation of said member, a normally inoperative tripping lever, and means controlled by the tripping lever to actuate said stop and release said driving connection.

3. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism and connections between the same and said member to operate the latter, said connection being normally in operative position, a normally inactive stop carried by said member, and a normally inoperative trip lever carried by, but movable relatively to, said member and normally holding said stop inoperative but adapted, when displaced by an obstruction, to cause the stop to operate and thereby arrest the movement of said member.

l. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, and connections between the driving mechanism and said member to ope ate the latter, a normally inactive stop carried by said member and tending to move into operative position, a relatively fixed member cooperating with said stop when the latter is operated, and a tripping lever normally restraining the stop from operating but adapted when displaced to release the stop.

5. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a normally inactive stop carried by said member, a trip lever carried by, but movable relatively to, said member and normally holding said stop inoperative but adapted, when displaced, to cause the operation of the stop, and a releasable driving connection between the driving mechanism and said member normally in operative position but actuable by the stop, when the latter is so operated, to sever the driving connection between the driving mechanism and said member.

6. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a releasable driving connection affording in its normal position a rigid connection between the driving mechanism and said member, a normally inoperative tripping lever, means controlled by the tripping lever to release said driving connection, and means operable in the continued operation of the driving mechanism to reinstate said driving connection.

7. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a releasable driving connection affording in its normal position a rigid connection between the driving mechanism and said member, a normally inoperative stop for arresting the movement of said member, a normally inoperative tripping lever, means controlled by the tripping lever to actuate said stop and release said driving connection, and means operable in the continued operation of the driving mechanism to reinstate said driving connectionand restore the stop to its normal inoperative position.

8. In safety stops for machinery, the com bination with a member the operation of which it is desired to automatically arrest, of driving mechanism, a normally inactive stop carried by said member, a trip lever carried by, but movable relatively to, said member and normally holding said stop in operative but adapted, when displaced, to cause the operation of the stop, a releasable driving connection between the driving mechanism and said member normally in operative position but actuable by the stop, when the latter is so operated, to sever the driving connection between the driving mechanism and said member, means operable in the continued operation of the driving mechanism to retract said member and reinstate said driving connection, and relatively fixed means cooperating with said stop to effect its movement into inoperative position during the retraction. of said member.

9. In a safety stop for machinery, the combination with a reciprocatory member the forward movement of which it is desired to automatically arrest, of driving mechanism, a swingable lever operable thereby and normally engaging and operating said member, a tripping lever, means controlled by the tripping lever to swing said swinging lever out ofoperative engagement with said member, and means operable in the backward movement of the driving mechanism to swing said swinging lever into operative position.

10. In a safety stop for machinery, the combination with a reciprocatory member the forward movement of which it is desired to automatically arrest, of driving mechanism, a swingable lever operable thereby, a pin on said member with which said swingable lever is normally engaged, a tripping lever, means controlled by the tripping lever to swing said swinging lever out of operative engagement with said pin, a slotted lever pivoted on said member on the axis of said pin, and a pin on said swingable lever normally engaging'said slotted lever and adapted to cooperate therewith, in the backward movement of the driving mechanism,

to swing said swingable lever into engagement with the first named 'pin.

11. In a safety stop for machinery, the combination with a reciprocating member the forward movement of which it is desired to automatically arrest, of'driving mechai stop bar from actuation.

12. In a safety stop for machinery. the combination with a reciprocating member the forward movementof which it is desired to automatically arrest, of driving mechanism, a swingable lever operable thereby and normally engaging and operating said member, a stop carried by said member, a trip lever carried by said member, and meanscontrolled by the trip lever to actuate the stop and arrest the forward movement of said member, said swingable lever being operable by the stop and adapted to be swung thereby out of driving engagement with said member, whereby said member is stopped and the driving mechanism rendered inoperative to tend to further advance said member.

18. In a safety stop for machinery, the combination with a reciprocating member the forward movement of which it is desired to automatically arrest, of driving mechanism, a swingable lever operable thereby and normally engaging and operating said member, a stop carried by said member, a trip lever carried by said member, means controlled by the trip lever to actuate the stop and arrest the forward movement of said member, said swingable lever being operable by the stop and adapted to be swung thereby out of driving engagement with said member, and slidable connections between the driving mechanism and said member operable, in the backward movement of the driving mechanism, to return the swingable lever into driving engagement with said member.

14. In a safety stop for machinery, the combination with a reciprocating member the forward movement of which it is desired to automatically arrest, of driving mechanism and releasable connections between the same and said member to reciprocate the latter, a stop carried by said member, a trip lever carried by said member, means controlled by the trip lever to actuate the stop and arrest the forward movement of said member, said stop, in its movement to arrest, adapted to release said driving connections, slidable connections between the driving mechanism and said member adapted to retract said member and reinstate the driving connections be tween the driving mechanism and said member, and means acting in the backward movement of said member to restore the stop to its initial position.

15. In a safety stop for machinery, the combination with a reciprocating member, the forward movement of which it is desired to automatically arrest, of driving mechanism and releasable connections between the same and said member to reciprocate the lat ter, a stop bar and a trip lever carried by said member, means controlled by the trip lever to actuate the stop bar, a relatively fixed ratchet cooperating with the stop bar, when so actuated, to arrest the forward movement of said member, slidable connec* tions between the driving mechanism and said member adapted to retract said member and reinstate the driving connections between the driving mechanism and said member, and a relatively fixed member adapted in the backward movement of said member to restore the stop bar to its normal inoperative position.

16. In safety stops for machinery, the combination with a member the operation of which it is desired to automatically arrest, of driving mechanism and connections between the driving mechanism and said member to operate the latter, a normally inactive stop-bar carried by said member and tending to move into operative position, a tripping lever normally restraining the bar from operating but adapted when displaced to release the bar, a relatively fixed ratchet cooperating with the bar when the latter is released, and an abutment adapted, in event of release of said bar when said member has nearly reached its forward limit of movement, to restrain the bar from moving from its inoperative position. I

17. In a safety stop for machinery, the combination with a reciprocating member the forward movement of which it is desired to automatically arrest and a pin carried by said member, of driving mechanism, a swinginglever operable thereby and normally engaging said pin, a fixed ratchet alongside said member, a spring-pressed stop-bar carried by said member and tending to be moved into engagement with said ratchet, a trip lever carried by said member and normally restraining the stop-bar from movement but adapted to be-operated said pin, and a fixed device adapted in the backward movement of said lever to return 1- the stop-bar to its inoperative position.

In testimony of which invention, We have hereunto set our hands at Philadelphia, on this 19th day of November, 1915.

BENJAMIN L. KABACK. SAMUEL SHELLY.

to release the same a lug on said swinging lever, operable by the bar in its movement after release, to push said leverout of driving engagement With said pin, a pin and slot connection between said pin and lever adapted, in the backward movement of the driving mechanism to retract said member and swing said lever into engagement With Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

